Changes

'''At the start of the hangout''': Presenters will be invited to the hangout.

'''At your presentation''': The ''em cee'' will give you full control of the presentation software, and you'll be able to share your full screen with the participants -- they will see what you see on your screen. Audio tones will cue you as to how much time you have left: four tones is four minutes left, three tones is three minutes left, and so forth. Two quick high-pitched tones means you have thirty seconds, and a long high-pitched tone means that time is up. You may want to run you own countdown timer to keep track of time as well.